arc/nps400: Add first nps400 instructions

arc/nps400: Add first nps400 instructions

Adds the first few nps400 instructions.

gas/ChangeLog:

	* testsuite/gas/arc/nps400-0.d: New file.
	* testsuite/gas/arc/nps400-0.s: New file.
	* testsuite/gas/arc/nps400-1.d: New file.
	* testsuite/gas/arc/nps400-1.s: New file.

include/ChangeLog:

	* opcodes/arc.h (insn_class_t): Add BITOP type.

opcodes/ChangeLog:

	* arc-nps400-tbl.h: New file.
	* arc-opc.c: Add top level comment.
	(insert_nps_3bit_dst): New function.
	(extract_nps_3bit_dst): New function.
	(insert_nps_3bit_src2): New function.
	(extract_nps_3bit_src2): New function.
	(insert_nps_bitop_size): New function.
	(extract_nps_bitop_size): New function.
	(arc_flag_operands): Add nps400 entries.
	(arc_flag_classes): Add nps400 entries.
	(arc_operands): Add nps400 entries.
	(arc_opcodes): Add nps400 include.